The largest life-form on land 400M years ago scientists can't explain

Scientists studying 400-million-year-old fossils called Prototaxites, which towered 30 feet tall over ancient landscapes, now believe these mysterious organisms represent an entirely unknown form of multicellular life rather than plants, animals, or fungi. Chemical analysis of exceptionally preserved fossils revealed biomarkers completely distinct from known life forms, suggesting these enigmatic giants evolved independently during Earth's early colonization period.